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Basically you work out what will run off 12v directly, look at what amps they draw. If you have to run 240v you need an inverter, these are only about 80% efficient. Add up all the amps, multiply by the number of hours you are going to run for and that's your amp-hours, which is your battery capacity. You can't completely drain the battery so probably double it and you will get somewhere near what you need in battery capacity.
Have a look on the caravan sites and you will find a number of books on designing these sort of systems.
Hope this helps
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